by Emma Richardson.
So at one point I remember that if you added them through the moodle add link interface they used to work but if you added them in the html directly they would not.
I am not saying they will not work - I have labels linking to activities that do indeed update but it seems like not always...I haven't played with it for a while but you might try readding a link making sure you use the Add Link in the editor and try it again...